include/linux/can/netlink.h

   1 /*
   2  * linux/can/netlink.h
   3  *
   4  * Definitions for the CAN netlink interface
   5  *
   6  * Copyright (c) 2009 Wolfgang Grandegger <wg@grandegger.com>
   7  *
   8  * Send feedback to <socketcan-users@lists.berlios.de>
   9  *
  10  */
  11
  12 #ifndef CAN_NETLINK_H
  13 #define CAN_NETLINK_H
  14
  15 #include <linux/types.h>
  16
  17 /*
  18  * CAN bit-timing parameters
  19  *
  20  * For futher information, please read chapter "8 BIT TIMING
  21  * REQUIREMENTS" of the "Bosch CAN Specification version 2.0"
  22  * at http://www.semiconductors.bosch.de/pdf/can2spec.pdf.
  23  */
  24 struct can_bittiming {
  25         __u32 bitrate;          /* Bit-rate in bits/second */
  26         __u32 sample_point;     /* Sample point in one-tenth of a percent */
  27         __u32 tq;               /* Time quanta (TQ) in nanoseconds */
  28         __u32 prop_seg;         /* Propagation segment in TQs */
  29         __u32 phase_seg1;       /* Phase buffer segment 1 in TQs */
  30         __u32 phase_seg2;       /* Phase buffer segment 2 in TQs */
  31         __u32 sjw;              /* Synchronisation jump width in TQs */
  32         __u32 brp;              /* Bit-rate prescaler */
  33 };
  34
  35 /*
  36  * CAN harware-dependent bit-timing constant
  37  *
  38  * Used for calculating and checking bit-timing parameters
  39  */
  40 struct can_bittiming_const {
  41         char name[16];          /* Name of the CAN controller hardware */
  42         __u32 tseg1_min;        /* Time segement 1 = prop_seg + phase_seg1 */
  43         __u32 tseg1_max;
  44         __u32 tseg2_min;        /* Time segement 2 = phase_seg2 */
  45         __u32 tseg2_max;
  46         __u32 sjw_max;          /* Synchronisation jump width */
  47         __u32 brp_min;          /* Bit-rate prescaler */
  48         __u32 brp_max;
  49         __u32 brp_inc;
  50 };
  51
  52 /*
  53  * CAN clock parameters
  54  */
  55 struct can_clock {
  56         __u32 freq;             /* CAN system clock frequency in Hz */
  57 };
  58
  59 /*
  60  * CAN operational and error states
  61  */
  62 enum can_state {
  63         CAN_STATE_ERROR_ACTIVE = 0,     /* RX/TX error count < 96 */
  64         CAN_STATE_ERROR_WARNING,        /* RX/TX error count < 128 */
  65         CAN_STATE_ERROR_PASSIVE,        /* RX/TX error count < 256 */
  66         CAN_STATE_BUS_OFF,              /* RX/TX error count >= 256 */
  67         CAN_STATE_STOPPED,              /* Device is stopped */
  68         CAN_STATE_SLEEPING,             /* Device is sleeping */
  69         CAN_STATE_MAX
  70 };
  71
  72 /*
  73  * CAN controller mode
  74  */
  75 struct can_ctrlmode {
  76         __u32 mask;
  77         __u32 flags;
  78 };
  79
  80 #define CAN_CTRLMODE_LOOPBACK   0x1     /* Loopback mode */
  81 #define CAN_CTRLMODE_LISTENONLY 0x2     /* Listen-only mode */
  82 #define CAN_CTRLMODE_3_SAMPLES  0x4     /* Triple sampling mode */
  83
  84 /*
  85  * CAN device statistics
  86  */
  87 struct can_device_stats {
  88         __u32 bus_error;        /* Bus errors */
  89         __u32 error_warning;    /* Changes to error warning state */
  90         __u32 error_passive;    /* Changes to error passive state */
  91         __u32 bus_off;          /* Changes to bus off state */
  92         __u32 arbitration_lost; /* Arbitration lost errors */
  93         __u32 restarts;         /* CAN controller re-starts */
  94 };
  95
  96 /*
  97  * CAN netlink interface
  98  */
  99 enum {
 100         IFLA_CAN_UNSPEC,
 101         IFLA_CAN_BITTIMING,
 102         IFLA_CAN_BITTIMING_CONST,
 103         IFLA_CAN_CLOCK,
 104         IFLA_CAN_STATE,
 105         IFLA_CAN_CTRLMODE,
 106         IFLA_CAN_RESTART_MS,
 107         IFLA_CAN_RESTART,
 108         __IFLA_CAN_MAX
 109 };
 110
 111 #define IFLA_CAN_MAX    (__IFLA_CAN_MAX - 1)
 112
 113 #endif /* CAN_NETLINK_H */